Nylanderia fulva, "Tawny crazy ant", ist superkolonial

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Nylanderia fulva, "Tawny crazy ant", ist superkolonial

Beitragvon Merkur » Mittwoch 16. Januar 2019, 12:23

Eyer, P. et al. (2018): Supercolonial structure of invasive populations of the tawny crazy ant Nylanderia fulva in the US. BMC Evolutionary Biology 18(1).
https://bmcevolbiol.biomedcentral.com/a ... 018-1336-5

Background: Social insects are among the most serious invasive pests in the world, particularly successful at monopolizing environmental resources to outcompete native species and achieve ecological dominance. The invasive success of some social insects is enhanced by their unicolonial structure, under which the presence of numerous queens and the lack of aggression against non-nestmates allow high worker densities, colony growth, and survival while eliminating intra-specific competition. In this study, we investigated the population genetics, colony structure and levels of aggression in the tawny crazy ant, Nylanderia fulva, which was recently introduced into the United States from South America. Results We found that this species experienced a genetic bottleneck during its invasion lowering its genetic diversity by 60%. Our results show that the introduction of N. fulva is associated with a shift in colony structure. This species exhibits a multicolonial organization in its native range, with colonies clearly separated from one another, whereas it displays a unicolonial system with no clear boundaries among nests in its invasive range. We uncovered an absence of genetic differentiation among populations across the entire invasive range, and a lack of aggressive behaviors towards conspecifics from different nests, even ones separated by several hundreds of kilometers. Conclusions Overall, these results suggest that across its entire invasive range in the U.S.A., this species forms a single supercolony spreading more than 2000 km. In each invasive nest, we found several, up to hundreds, of reproductive queens, each being mated with a single male. The many reproductive queens per nests, together with the free movement of individuals between nests, leads to a relatedness coefficient among nestmate workers close to zero in introduced populations, calling into question the stability of this unicolonial system in which indirect fitness benefits to workers is apparently absent.

„Soziale Insekten gehören zu den schlimmsten invasiven Schädlingen der Welt...“

Wie so oft zeigt sich, dass auch die südamerikanische Nylanderia fulva (Formicinae, Tribus Lasiini) in Nordamerika ihre Populationsstruktur (ursprünglich separate Einzelnester) nach der Einschleppung verändert, hin zu einer superkolonialen Struktur: Hochgradige Polygynie und keine Abgrenzung mehr zwischen einzelnen Nestern bzw. Völkern. Seit ihrer Einschleppung in die USA in 2002 bildet die Art eine einzige Superkolonie von mehr als 2000 km Ausdehnung über ihr bisheriges Invasionsgebiet.
S. a.: http://www.antwiki.org/wiki/Nylanderia_fulva


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